Boundary lubrication: layering transition for curved solid surfaces with long-range elasticity

The properties of an atomic lubricant confined between two approaching surf aces are investigated by molecular dynamics. In the limit of thin interface s, the lubricant atoms form well defined layers, whose number decreases in discontinuous steps with increasing applied pressure. These transitions occ ur easily and completely for unpinned lubricant films, while they are slugg ish and incomplete in the case of strong pinning. Before the transition, an intermediate phase arises, which facilitates the thinning of the lubricant . Lateral sliding of the surfaces enhances the thinning rate. (C) 2000 Else vier Science Ltd. All rights reserved.